Absorption spectra of AsH 2 radical in 435–510 nm by cavity ringdown spectroscopy

Abstract

The absorption spectra of jet-cooled AsH 2 radicals were recorded in the wavelength range of 435–510 nm by cavity ringdown spectroscopy. The AsH 2 radicals were produced by pulsed DC discharge in a molecular beam of a mixture of AsH 3, SF 6, and argon. Seven vibronic bands with fine rotational structures have been identified and assigned as the 0 0 0 , 2 0 n , and 2 1 n ( n = 1–3) bands of the A ∼ 2 A 1 – X ∼ 2 B 1 electronic transition. Based on the previous studies of AsH 2 radical, rotational assignments and rotational term values for each band were obtained, and the molecular parameters including vibrational constants, rotational constants, centrifugal distortion constants, and spin–rotation interaction constants were also determined.